Programming Forums > Web Development and Design > JavaScript and Client-Side Browser Scripting

littlejim4 · Dec 10th, 2007, 1:52 AM

Hi all,

I have a bit of a problem with a project and was hoping that somebody could help me out. Here goes!

I have a set of integers ie (1,-2,0,4,-5,0,7,-8,0,10) what I need to do is loop through and then return only the positive integers leaving out the negatives. This is easy enough but I have to return the index positions of the positive integers ie, (1,3,4,6,7,9,10). However I'm having major trouble with the logic because I need the integers in reverse order. What I get is the index integers from 1-7 not waht I need.

Can anybody help me out with this one. Many thanks in advance.

hollystyles · Dec 10th, 2007, 3:07 AM

Just loop the array of integers in reverse.

(Toggle Plain Text)

var integerArray = [1,-2,0,4,-5,0,7,-8,0,10];
var positiveInts = [];
for(var i = integerArray.length - 1, i >= 0, --i)
{
     if(integerArray [i] >= 0)
        positiveInts[positiveInts.length] = integerArray[i];
}

littlejim4 · Dec 10th, 2007, 8:39 AM

Many thanks,

I was getting bogged down by the logic.

Dec 10th, 2007, 1:52 AM	#1
littlejim4 Newbie Join Date: Dec 2007 Location: South Wales Posts: 4 Rep Power: 0	Returning Index Hi all, I have a bit of a problem with a project and was hoping that somebody could help me out. Here goes! I have a set of integers ie (1,-2,0,4,-5,0,7,-8,0,10) what I need to do is loop through and then return only the positive integers leaving out the negatives. This is easy enough but I have to return the index positions of the positive integers ie, (1,3,4,6,7,9,10). However I'm having major trouble with the logic because I need the integers in reverse order. What I get is the index integers from 1-7 not waht I need. Can anybody help me out with this one. Many thanks in advance.

Dec 10th, 2007, 3:07 AM	#2
hollystyles Omlette du fromage Join Date: Oct 2007 Posts: 29 Rep Power: 0	Re: Returning Index Just loop the array of integers in reverse. (Toggle Plain Text) var integerArray = [1,-2,0,4,-5,0,7,-8,0,10]; var positiveInts = []; for(var i = integerArray.length - 1, i >= 0, --i) { if(integerArray [i] >= 0) positiveInts[positiveInts.length] = integerArray[i]; } var integerArray = [1,-2,0,4,-5,0,7,-8,0,10]; var positiveInts = []; for(var i = integerArray.length - 1, i >= 0, --i) { if(integerArray [i] >= 0) positiveInts[positiveInts.length] = integerArray[i]; }

Dec 10th, 2007, 8:39 AM	#3
littlejim4 Newbie Join Date: Dec 2007 Location: South Wales Posts: 4 Rep Power: 0	Re: Returning Index Many thanks, I was getting bogged down by the logic.

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